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In slab-on-grade construction, the soil cover consists of the soil gas-retarder membrane and the concrete slab. In crawl spaces, the concrete slab may be omitted, providing the soil gas-retarder membrane will not be subjected to wear and damage due to required maintenance procedures. In all instances, the soil gas-retarder membrane shall be fully sealed to the radon vents in accordance with the provisions of Section E302.
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E402.2 Florida Standard for Radon-Resistant New Commercial Construction, Soil Cover
In slab-on-grade construction, the soil cover consists of the soil gas-retarder membrane and the concrete slab. In crawl spaces, the concrete slab ...